National Academy of Sports Medicine (NASM) Certified Personal Trainer (CPT) Practice Exam

What is a primary function of dietary macronutrients?

1. Regulate body processes

2. Produce energy

3. Build muscle tissue

4. Support immune function

The correct answer is: Produce energy

A primary function of dietary macronutrients is to produce energy, which is essential for all bodily functions. Macronutrients—including carbohydrates, proteins, and fats—are the body’s main source of energy. Carbohydrates are the most immediate source of energy, as they are broken down into glucose, which can then be used by the body for quick energy needs. Fats provide a more concentrated source of energy and are vital for prolonged energy release, especially during low-intensity activities and while at rest. Proteins, while primarily used for building and repairing tissues, can also be converted to energy when carbohydrate stores are low. While macronutrients have roles in regulating bodily processes, building muscle tissue, and supporting immune function, these are not their primary roles. The primary purpose revolves around energy production, which is fundamental for everything from cellular maintenance to physical activities. Thus, the emphasis on energy production highlights the essential role macronutrients play in fueling the body.